mirror of https://bitbucket.org/ausocean/av.git
347 lines
8.7 KiB
Go
347 lines
8.7 KiB
Go
/*
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NAME
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revid - a testbed for re-muxing and re-directing video streams as MPEG-TS over various protocols.
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DESCRIPTION
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See Readme.md
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AUTHORS
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Alan Noble <anoble@gmail.com>
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Saxon A. Nelson-Milton <saxon.milton@gmail.com>
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LICENSE
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revid is Copyright (C) 2017 Alan Noble.
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It is free software: you can redistribute it and/or modify them
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under the terms of the GNU General Public License as published by the
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Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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It is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with revid in gpl.txt. If not, see [GNU licenses](http://www.gnu.org/licenses).
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*/
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// revid is a testbed for re-muxing and re-directing video streams as MPEG-TS over various protocols.
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package revid
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import (
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"bufio"
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"bytes"
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"fmt"
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"io"
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"io/ioutil"
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"net"
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"net/http"
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"os"
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"os/exec"
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"strconv"
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"time"
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"bitbucket.org/ausocean/av/h264"
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"bitbucket.org/ausocean/av/tsgenerator"
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"bitbucket.org/ausocean/av/ringbuffer"
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"bitbucket.org/ausocean/utils/smartLogger"
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)
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// defaults and networking consts
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const (
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clipDuration = 1 // s
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mp2tPacketSize = 188 // MPEG-TS packet size
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mp2tMaxPackets = 2016 * clipDuration // # first multiple of 7 and 8 greater than 2000
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udpPackets = 7 // # of UDP packets per ethernet frame (8 is the max)
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rtpPackets = 7 // # of RTP packets per ethernet frame (7 is the max)
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rtpHeaderSize = 12
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rtpSSRC = 1 // any value will do
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bufferSize = 100 / clipDuration
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httpTimeOut = 5 // s
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packetsPerFrame = 7
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h264BufferSize = 500000
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bitrateTime = 60
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)
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// Log Types
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const (
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Error = "Error"
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Warning = "Warning"
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Info = "Info"
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Debug = "Debug"
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)
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// Config enums
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const (
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Raspivid = 0
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Rtp = 1
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H264Codec = 2
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File = 4
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HttpOut = 5
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)
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type Config struct {
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Input uint8
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InputCmd string
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Output uint8
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OutputFileName string
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InputFileName string
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Height string
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Width string
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Bitrate string
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FrameRate string
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HttpAddress string
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Quantization string
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Logger smartLogger.LogInstance
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}
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type RevidInst interface {
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Start()
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Stop()
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ChangeState(newconfig Config) error
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GetConfigRef() *Config
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Log(logType, m string)
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IsRunning() bool
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}
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type revidInst struct {
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dumpPCRBase uint64
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conn net.Conn
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ffmpegPath string
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tempDir string
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ringBuffer ringbuffer.RingBuffer
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config Config
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isRunning bool
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outputFile *os.File
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inputFile *os.File
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generator tsgenerator.TsGenerator
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h264Parser h264.H264Parser
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cmd *exec.Cmd
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inputReader *bufio.Reader
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}
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func NewRevidInstance(config Config) (r *revidInst, err error) {
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r = new(revidInst)
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r.ringBuffer = ringbuffer.NewRingBuffer(bufferSize, mp2tPacketSize*mp2tMaxPackets)
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r.dumpPCRBase = 0
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r.ChangeState(config)
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switch r.config.Output {
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case File:
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r.outputFile, err = os.Create(r.config.OutputFileName)
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if err != nil {
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return nil, err
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}
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}
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switch r.config.Input {
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case File:
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r.inputFile, err = os.Open(r.config.InputFileName)
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if err != nil {
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return nil, err
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}
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}
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r.generator = tsgenerator.NewTsGenerator(25)
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r.generator.Start()
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r.h264Parser = h264.H264Parser{OutputChan: r.generator.GetNalInputChan()}
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r.h264Parser.Start()
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go r.input()
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r.Log(Info, "New revid instance created! config is:")
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r.Log(Info, fmt.Sprintf("%v", r.config))
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return
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}
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func (r *revidInst) GetConfigRef() *Config {
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return &r.config
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}
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func (r *revidInst) ChangeState(newconfig Config) error {
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// TODO: check that the config is legit
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r.config = newconfig
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return nil
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}
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func (r *revidInst) Log(logType, m string) {
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r.config.Logger.Log(logType, m)
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}
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func (r *revidInst) IsRunning() bool {
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return r.isRunning
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}
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func (r *revidInst) Start() {
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if r.isRunning {
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r.Log(Warning, "revidInst.Start() called but revid already running!")
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return
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}
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r.Log(Info, "Starting Revid!")
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var h264Data []byte
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switch r.config.Input {
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case Raspivid:
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r.Log(Info, "Starting raspivid!")
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r.cmd = exec.Command("raspivid", "-o", "-", "-n", "-t", "0", "-b",
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r.config.Bitrate, "-qp", r.config.Quantization, "-w", r.config.Width, "-h", r.config.Height, "-fps", r.config.FrameRate, "-ih", "-g", "100")
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stdout, _ := r.cmd.StdoutPipe()
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err := r.cmd.Start()
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r.inputReader = bufio.NewReader(stdout)
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if err != nil {
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r.Log(Error, err.Error())
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return
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}
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r.isRunning = true
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go func() {
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r.Log(Info, "Reading camera data!")
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for r.isRunning {
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h264Data = make([]byte, 1)
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_, err := io.ReadFull(r.inputReader, h264Data)
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switch {
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case err != nil && err.Error() == "EOF" && r.isRunning:
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r.Log(Error, "No data from camera!")
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time.Sleep(5 * time.Second)
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case err != nil && r.isRunning:
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r.Log(Error, err.Error())
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default:
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r.h264Parser.InputByteChan <- h264Data[0]
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}
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}
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r.Log(Info, "Out of reading routine!")
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}()
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case File:
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stats, err := r.inputFile.Stat()
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if err != nil {
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r.Log(Error, "Could not get input file stats!")
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r.Stop()
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return
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}
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h264Data = make([]byte, stats.Size())
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_, err = r.inputFile.Read(h264Data)
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if err != nil {
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r.Log(Error, err.Error())
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r.Stop()
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return
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}
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for i := range h264Data {
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r.h264Parser.InputByteChan <- h264Data[i]
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}
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}
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go r.output()
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}
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func (r *revidInst) Stop() {
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if r.isRunning {
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r.Log(Info, "Stopping revid!")
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r.isRunning = false
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r.cmd.Process.Kill()
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} else {
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r.Log(Warning, "revidInst.Stop() called but revid not running!")
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}
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}
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func (r *revidInst) input() {
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clipSize := 0
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packetCount := 0
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now := time.Now()
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prevTime := now
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for {
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if clip, err := r.ringBuffer.Get(); err != nil {
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r.Log(Error, err.Error())
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r.Log(Warning, "Clearing TS chan!")
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for len(r.generator.GetTsOutputChan()) > 0 {
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<-(r.generator.GetTsOutputChan())
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}
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time.Sleep(1 * time.Second)
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} else {
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for {
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tsPacket := <-(r.generator.GetTsOutputChan())
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tsByteSlice, err := tsPacket.ToByteSlice()
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if err != nil {
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r.Log(Error, err.Error())
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}
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upperBound := clipSize + mp2tPacketSize
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copy(clip[clipSize:upperBound], tsByteSlice)
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packetCount++
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clipSize += mp2tPacketSize
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// send if (1) our buffer is full or (2) 1 second has elapsed and we have % packetsPerFrame
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now = time.Now()
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if (packetCount == mp2tMaxPackets) ||
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(now.Sub(prevTime) > clipDuration*time.Second && packetCount%packetsPerFrame == 0) {
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if err := r.ringBuffer.DoneWriting(clipSize); err != nil {
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r.Log(Error, err.Error())
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r.Log(Warning, "Dropping clip!")
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}
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clipSize = 0
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packetCount = 0
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prevTime = now
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break
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}
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}
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}
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}
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}
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func (r *revidInst) output() {
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now := time.Now()
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prevTime := now
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bytes := 0
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delay := 0
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for r.isRunning {
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switch {
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case r.ringBuffer.GetNoOfElements() < 2:
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delay++
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time.Sleep(time.Duration(delay) * time.Millisecond)
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case delay > 10:
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delay -= 10
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}
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if clip, err := r.ringBuffer.Read(); err == nil {
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r.Log(Debug, fmt.Sprintf("Delay is: %v\n", delay))
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r.Log(Debug, fmt.Sprintf("Ring buffer size: %v\n", r.ringBuffer.GetNoOfElements()))
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switch r.config.Output {
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case File:
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r.outputFile.Write(clip)
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case HttpOut:
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bytes += len(clip)
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for err := r.sendClipToHTTP(clip, r.config.HttpAddress); err != nil; {
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r.Log(Error, err.Error())
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r.Log(Warning, "Post failed trying again!")
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err = r.sendClipToHTTP(clip, r.config.HttpAddress)
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}
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default:
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r.Log(Error, "No output defined!")
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}
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if err := r.ringBuffer.DoneReading(); err != nil {
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r.Log(Error, err.Error())
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}
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now = time.Now()
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deltaTime := now.Sub(prevTime)
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if deltaTime > time.Duration(bitrateTime)*time.Second {
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r.Log(Info, fmt.Sprintf("Bitrate: %v bits/s\n", int64(float64(bytes*8)/float64(deltaTime/1e9))))
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r.Log(Info, fmt.Sprintf("Ring buffer size: %v\n", r.ringBuffer.GetNoOfElements()))
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prevTime = now
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bytes = 0
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}
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}
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}
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}
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// sendClipToHTPP posts a video clip via HTTP, using a new TCP connection each time.
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func (r *revidInst) sendClipToHTTP(clip []byte, output string) error {
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timeout := time.Duration(httpTimeOut * time.Second)
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client := http.Client{
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Timeout: timeout,
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}
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url := output + strconv.Itoa(len(clip))
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r.Log(Debug, fmt.Sprintf("Posting %s (%d bytes)\n", url, len(clip)))
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resp, err := client.Post(url, "video/mp2t", bytes.NewReader(clip)) // lighter than NewBuffer
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if err != nil {
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return fmt.Errorf("Error posting to %s: %s", output, err)
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}
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defer resp.Body.Close()
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body, err := ioutil.ReadAll(resp.Body)
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if err == nil {
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r.Log(Debug, fmt.Sprintf("%s\n", body))
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} else {
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r.Log(Error, err.Error())
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}
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return nil
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}
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